It was first spotted by an eagle-eyed Amazon user, who immediately shared her discovery (and frustration towards Harry and Meghan) on Twitter.
The blissfully unaware user called the post "pathetic and immature" before adding: "No self-respecting author would do this".
Many more outraged Twitter users flocked to the post, with one saying they were "cringing for them".
Another accused the post of having "Meghan's handprints all over it".
Meanwhile, a third wrote: "They are the gift that keeps on giving aren't they".
\u201cLet's get this straight - Harry & Meghan buy a copy of their book on Amazon and then they give themselves a glowing 5-Star review\u2049\ufe0f \ud83d\ude35\u200d\ud83d\udcab\ud83d\ude06\n\nHow pathetic & immature as no self-respecting author would do this. This needs to be front-page news.\ud83d\udd0d\ud83e\udd23\ud83d\udc47\n\n#SpareUsHarry \n#SparePrinceHarry\u201d